Composite Long Rod Insulators

72.5 kV to 800 kV

Composite long rod insulators provide lightweight, high-strength insulation for overhead transmission lines from 72.5 kV to 800 kV.

Designed for suspension and tension applications, they combine an ECR glass FRP rod with an HTV silicone rubber housing for high mechanical strength and excellent electrical performance.

Product Range

• Voltage Class (Um): 72.5 kV – 800 kV

• Mechanical Class (SML): 70 kN – 630 kN

• Suspension and tension applications

• ECR glass, boron-free FRP rod

• Brittle fracture, hydrolysis and acid resistant

• HTV silicone rubber housing

• Hydrophobicity transfer mechanism

• Direct-injection silicone moulding

• Forged steel end fittings

• Integrated grading rings where required

• Configurations available with line hardware and surge arresters

A wide range of lengths, mechanical ratings, fittings and configurations can be supplied to suit specific transmission line requirements.

Composite Post Insulators

High Voltage Substation Insulators

Composite post insulators provide high mechanical strength and electrical insulation for substations, power generation and high-voltage equipment applications.

Their composite construction provides a lightweight alternative to traditional porcelain while offering excellent performance in demanding and polluted environments.

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Product Range

• Voltage Class (Um): up to 800 kV

• Mechanical Class (SML): 18 kN – 150 kN

• Suitable for AC and DC applications

• ECR fibreglass core

• HTV silicone rubber housing

• Multi-shot injection moulding

• High mechanical strength

• Corrosion resistant

• Designed to prevent moisture ingress

• IEC and ANSI tested configurations available

Externally Gapped Line Arrester (EGLA)

132 to 500kV Insulated from the high-voltage line by series gap

Siemens Energy's EGLA line surge arresters incorporate an external spark gap arranged in series to provide galvanic isolation between the active section of the surge arrester and the line voltage during normal operational conditions.

During a lightning event, the spark gap activates, allowing the arrester to limit the ground fault current from several kiloamperes down to just a few amperes.

This rapid response extinguishes any arcs within 10 milliseconds, eliminating the need for circuit breaker operations at both ends of the line, effectively preventing reclosing operations.

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Non-Gapped Line Arrester (NGLA) 

132 to 500kV Direct Connection to Overhead Line

Siemens Energy's Non-gapped line surge arresters (NGLA) provide exceptional mounting versatility and operational reliability. Depending on the tower's configuration and the positioning of insulators and power lines, these arresters can be directly affixed to either the insulators or the tower structure. NGLAs effectively limit overvoltages to levels well below the withstand voltage of insulators.

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